Relación entre la abundancia de foraminíferos y las condiciones tróficas de la zona marino-costera, al oeste de la India

Surface seawater and sediment parameters indicate the trophic state of coastal marine systems. We used a biochemical approach to identify descriptors of the trophic state and environmental quality of intertidal ecosystems, based on the analysis of the quality and quantity of sedimentary organic matter, water nutrients and their correlation with the foraminiferal population at two sites on the west coast of India. Surface intertidal sediments were collected for a period of 17 months from January 2012 to May 2013 at intervals of two months by using a short core tube. Total foraminiferal number and live foraminiferal number showed a peak during the post-monsoon period, when there is an enrichment of sediment chlorophyll a as well as a dominance of carbohydrates over sedimentary protein. Thus, a small change in the trophic status of the environment from a lower oligotrophic to a higher oligotrophic condition is responsible for the enhancement of foraminiferal population and diversity in the study sites. In particular, sediment protein concentration appeared to be a good descriptor of the trophic state. A gradual increase in foraminiferal population from a protein-rich, fresh organic matter environment to a carbohydrate-rich, detritus organic matter environment indicates the foraminiferal preference for detritus food sources. Thus, the main regulation factor for abundance and diversity of foraminifera at the study sites is trophication.Los parámetros del agua de mar superficial y del sedimento son indicadores del estado trófico de los sistemas marinos costeros. Hemos usado una aproximación bioquímica para identificar los descriptores del estado trófico y calidad ambiental de los ecosistemas intermareales, basado en el análisis de la calidad y la cantidad de materia orgánica sedimentaria, de los nutrientes del agua y su correlación con la población de foraminíferos en dos lugares de la costa oeste de la India. Las muestras de la superficie de los sedimentos intermareales se recogieron durante un período de diecisiete meses desde enero de 2012 a mayo de 2013, a intervalos de dos meses mediante el uso de un corer. El número total de foraminíferos (TFN), así como el número de foraminiferos vivos (LFN) mostró un pico durante el periodo posterior al monzón cuando se produce un enriquecimiento de clorofila a en el sedimento y un dominio de la concentración de hidratos de carbono sobre la de las proteínas sedimentarias. Por tanto, un cambio pequeño en el estado trófico del medio ambiente desde condiciones de menos a más oligotróficas son responsables de la mejora de la población y la diversidad de foraminíferos en los sitios de estudio. En particular, la concentración de proteína del sedimento resultaba ser un buen descriptor del estado trófico del sistema. Un incremento gradual de la población de foraminíferos desde un ambiente rico en proteínas y materia orgánica fresca a uno rico en carbohidratos y materia orgánica detrítica indica que los foraminíferos prefieren las fuentes de alimento de detritus. Así, el factor de regulación principal para la abundancia y diversidad de foraminíferos se debe al distinto grado trófico del sistema

Studies on Nodulation, Biochemical Analysis and Protein Profiles of Rhizobium Isolated From Indigofera species

Nodulation characteristics in five species of Indigofera viz., I .trita, I. linnaei, I. astragalina, I. parviflora and I. viscosa was studied at regular intervals on the plants raised in garden soil. Among the species studied, highest average number of nodules per plant of 23 with maximum sized nodules of 8.0 mm diameter was observed in I. astragalina. Biochemical analysis of root nodules of I. astragalina revealed that the leghaemoglobin content of nodules and nitrogen content of root, shoot, leaves and nodules were gradually increased up to 60 DAS, and then decreased with increase in age. Rhizobium isolates of five species of Indigofera were isolated and screened for enzymatic activities and total cellular protein profiles. All the five isolates showed nitrate reductase, citrase, tryptophanase and catalase activity while much variation was observed for enzymes like gelatinase, urease, caseinase, lipase, amylase, lysine decarboxylase and protease activities. Among the isolates studied, only the isolate from I. viscosa has the ability to solubilize the insoluble tricalcium phosphate. All the Rhizobium isolates exhibit similarity in protein content, except the isolate from I. viscosa which showed one additional protein band

Catalytic Reactive Distillation for the Esterification Process: Experimental and Simulation

In the present study, methyl acetate has been synthesized using esterification of acetic acid with methanol in a continuous packed bed catalytic reactive distillation column in the presence of novel Indion 180 ion exchange resin solid catalyst. The experiments were conducted at various operating conditions like reboiler temperature, reflux ratio, and different feed flow rates of the acetic acid and methanol. The non-ideal pseudo-homogeneous kinetic model has been developed for esterification of acetic acid with methanol in the presence of Indion 180 catalyst. The developed kinetic model was used for the simulation of the reactive distillation column for the synthesis of methyl acetate using equilibrium stage model in Aspen Plus version 7.3. The simulation results were compared with experimental results, and found that there is a good agreement between them. The sensitivity analyses were also carried out for the different parameters of bottom flow rate, feed temperatures of acetic acid and methanol, and feed flow rate of acetic acid and methanol. This work is licensed under a Creative Commons Attribution 4.0 International License

Effect of π Orbital on I/V Characteristics and Transmission in Molecular Diode Structures with Au Contacts

The electronic transport properties of electrons in a molecules are observed by using Non equilibrium Green’s function(NEGF). We present a extremely through and careful computational approach well ordered method to do a framework analysis of donor (CH3) and acceptor (CN) molecules connected between the Au(111) contacts, and also observed current progress through molecular devices depends on number of bonds or not. Such observations implementation through not possible by standard quantum chemistry soft wares. The results shows I-V characteristics, Transport spectrum and Transport analysis can effectively tune the molecules works like a conventional semi-conductor based diodes, these results invoke to design the logic gates and logic circuits

Use of information resources in chemistry: a study of Mangalore University Library

175-183 Through a questionnaire survey, data collected from 138 users from the Department of Chemistry, Mangalore University revealed that majority of the users visit the library to borrow books, to consult periodicals and browse UGC INFONET journals. OPAC and the assistance of the library staff are the primary means to locate information. The library resources in chemistry are current and useful but the periodicals both primary and secondary are inadequate. Concludes that various findings of the present study serve as guiding principles in developing need based collection and provide effective services to the users’ community of the department of chemistry of the Mangalore University in particular and paves the way for conducting similar studies in other disciplines. </smarttagtype

Library and information service facilities in Mangalore university library from the research scholars' point of view: A survey

155-165<span style="font-size:12.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa;="" mso-bidi-font-style:italic"="" lang="EN-US">The relevance and dependability of users study are described. An attempt is made to elicit <span style="mso-bidi-font-style: italic">opinions from the research scholars as <span style="mso-bidi-font-style: italic">the users of the Mangalore University Library. A questionnaire is used to make a survey of the use of information service facilities of the university library. The analysis of the data thus collected, covers the use <span style="mso-bidi-font-style: italic">of the library collection, library catalogue, library service facilities, etc. and the information needs of the users of the library. Finally, it highlights the suggestions made by the research scholars for the future planning of the library.</span

Impact of Organizational Culture on Employee Involvement in LIS Professionals

This study defines and measures how involvement is affected by organizational culture and our objective of this study is to examine and measure them. The study is expected to enable their effective role of organizational culture and help the professionals to implement the culture and help to increase theefficiency of involvement and productivity. After analysis of wide literature, we have come to know that both variables are positively correlated with each other and organizational culture and employee involvement has strong relationship. Cultures that are agreed upon by the employees working in the sameorganizations showed that the level of involvement increase and helps the academic grow effectively. Their relationship can be further explored through more deep research

Chloroallyl anion : highly regio- and diastereoselective α-addition of chloroallyl zinc reagent to carbonyl compounds

The chloroallyl zinc reagent generated insitu by deprotonation of allyl chloride in the presence of lithium diisopropylamide and zinc chloride undergoes highly regio- and diastereoselective α-addition to carbonyl compounds to give syn chlorohydrins which on treatment with base afford cis vinyloxiranes in high yields. The chloroallyl zinc reagent undergoes highly regio- and diastereoselective α-addition to carbonyl compounds to give syn chlorohydrines